Boiler construction.



A. B..STIRLING.

BOILER CONSTRUCTION.

APPLICATION FILED MAY 20, 1910. r 977,144, Patented Nov. 29, 1910.

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A. B. STIRLING.

BOILER CONSTRUCTION. APPLIOATION FILED MAY 20, 1910.

Patented Nov. 29, 1 910.

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ALISON B. STIRLING, OF PLEASANT MOUNT, PENNSYLVANIA.

BOILER CONSTRUCTION.

Specification of Letters Patent.

Patented Nov. 29, 1910.

Original application filed December 18, 1909, Serial No. 533,932.Divided and this application filed May 20,

1910. Serial No. 562,373.

To all whom it may concern:

Be it known that I, ALISON B. STIRLING, a citizen of the United States,residing at Pleasant Mount, in the county of WVaync and State ofPennsylvania, have invented certain new. and useful Improvements inBoiler Construction, of which the following is a full, clear, and exactdescription, such as will enable others skilled in the art to which itappertains to make and use the same.

This invention relates to improvements in boiler construction, and withregard to the more specific features thereof, to horizontal boilers ofthe water-tube type.

One of the objects of the invention is to provide a practical boilerwhich will have a high heating efliciency, the construction being suchthat the water will have a definite and positive circulation and thecoolest gases will be directed against the tubes containing the coolestwater.

A further object is to provide simple and eflicient protective means forthe exposed parts of the boiler against the direct flow of the furnacegases.

Other objects will be in part obvious and in part pointed outhereinafter.

The invention accordingly consists in the features of construction,combinations of elements and arrangement of parts which will beexemplified in the construction hereinafter set forth, and the scope ofthe application of which will be indicated in the following claims.

In the accompanying drawings wherein is illustrated one of variouspossible embodiments of my invention-Figure 1 is a longitudinal sectionof the boiler setting, taken on line 00-20 of Fig. 2, the boiler properbeing shown in side elevation; in Fig. 2 the portion to the left of thecenter line is a cross-section on line 'yg of Fig. 1, and the portion tothe right of the center line is a section on line zz of Fig. 1.

Similar reference characters refer to similar parts in all views of thedrawings.

Referring now to the drawings, 1 indicates the foundation or base whichsupports the furnace and the boiler setting 2. The firebox isrepresented at 3, the upper wall of said fire-box bein formed by an arch4c, in which is formed a closed aperture 5. A stack 6 leads from thesetting of the boiler near the lower portion thereof above the fire-box.At this point it may be noted that while, in the present instance, twofireboxes having independent stacks are employed, which stacks may, ifdesired, be connected with a common flue or chimney, these portions ofthe construction are similar in all respects, and a description of oneside of the boiler, therefore, will suflice to impart a clearunderstanding of the invention.

Stack 6 is provided with anormally closed aperture 7, and the front wall8 of the setting of the boiler is likewise provided with a normallyclosed aperture 9, said apertures being designed to permit of readyremoval of dust and ashesfrom the setting.

In the central portion of the boiler is a longitudinally extendingwater-drum 10 from which lead a plurality of substantially verticallydisposed tubes 11, the upper ends of which lead into a steam andwaterdrum 12 extending longitudinally of the upper portion of thesetting. A pair of bafiles 13 and let extend upwardly between tubes 11,and a battle 15 extends downwardly between said tubes and is interposedbetween baffles 13 and 14. Baiile 14 is provided with an aperture 16arranged in longitudinal alinement with the aperture 9 in wall 8. Itwill be observed that the arrangement of the battles with respect to thetubes of the boiler provides channels so that the heated gases will passprogressively from the furnace through the spaces occupied by thesetubes before the same are discharged from the boiler through the stack6.

Tater-drum 10 is provided with a transverse partition 17 which dividesthe same into front and rear compartments 18 and 19, respectively, thispartition, in the present instance, being located immediately below thebaffle 14 and adapted to compel the water flowing into the compartment18, through a feed connection 20 located near the upper part of thewater-drum 10, to flow in an upward direction through the series ofwater-tubes disposed forwardly of the said baffle. The partition 17 asshown, is removably secured to an angle iron 21 fastened to the shell ofdrum 10. A second angle 22 is fastened to the shell at another point, inthe present case, in line with battle 15. If desired, the position ofthe partition may be changed by detaching from angle 21 and securing toangle 22. It will be ob served that the water circulates through theentire drum may be blown off through said site direction to that of thegases, it, of

tubes 11 of the boiler, in a direction opposite j to that traveled bythe heated gases from the furnace, and that the baffles are disposed insuch manner that the coolest gases are brought into contact with thetubes containing the coolest water.

Blow-off pipe 23 leads from the compartment 18 of the water-drum 10 and,if desired, partition 17 may be provided with an aperture in its lowerportion so that the blowofi pipe 23 or through the transverselyextending drum 2st which is connected to the water-drum 10 by a pipeconnection 25 in a position substantially beneath the rearward end ofthe arch l. A wall 26 is supported upon said drum 24 and extendsupwardly into contact with the end of said arch and beyond said arch toform the baffle 13. This drum 24: is provided with a blow-off pipe 27.Closed end circulating tubes 28 extend rearwardly from the centralportion of said transverse drum 24: and into the rear boiler wall forsupport. These tubes have a slight downward inclination, and supportedthereon is a baffie 29 composed of refractory tiles. As the said tubesand baffle are located substantially beneath the water-drum theyeffectually prevent the latter from being injured by the direct flow ofthe furnace gases, and it is to be noted further that the arrangement ofthe transverse drum 2% protects the wall '26 and the arch 4: from injurydue to the high temperature obtaining at this point.

In operation it will be seen that the gases from the furnace passbeneath the transverse drum 24 and upwardly to the tubes 11 of theboiler. Said gases will be deflected away from the drum 10 by means ofthe baffle 29 and tubes 28. The waterin said tubes becoming heated,flows upwardly into the drum 24, cooler water from said drum passingdownwardly in said tubes along the lower wall thereof. The water fromsaid tubes will have acquired a high degree of heat, and passingupwardly through the connection 25, will greatly aid in the circulationof the water from the rear portion of the drum 10 upwardly through thetubes 11, thereby causing active circulation in the rear portion of saiddrum and preventing injury to the walls thereof at this point. 'It willbe seen that the gases, while surrounding the vertical tubes 11, willfirst pass upward between baflle 13 and the rear of the boiler setting,then downward between bafiies 13 and 15, then upward between baffles 15and 1%, and finally downwardbetween baiiies 14 and the front of theboiler setting to the stack 6; and as the water within the boiler iscirculating through the tubes in an oppocourse, follows that the coolestgases will be in contact with the tubes containing the coolest water.

It will accordingly be seen that I have provided a construction welladapted to attain, among others, all the ends and objects above pointedout in a simple, yet efficient manner. By reason of the fact that thecoolest gases are always in contact with tubes containing the coolestwater, there is provided an economical and thorough abstraction of theheat carried by said gases. It will further be seen that by providing atransverse drum located beneath the wall 26 and by connecting it to thewater-drum near the rear end of the same, said wall, waterdrum and arch4C are effectively protected from the effects of the high temperatureobtaining in this region.

As many changes could be made in the above construction and manyapparently widely different embodiments of this invention could be madewithout departing from the scope thereof, it is intended that all mattercontained in the above description or shown in the accompanying drawingsshall be interpreted as illustrative and not in a limiting sense. It isalso tobe understood that the language used in the following claims isintended to cover all of the generic and specific features of theinvention herein "described and all statements of the scope of theinvention, which, as a matter of language, might be said to falltherebetween.

It is to be noted that certain features relating to this invention havebeen de scribed and claimed in my copending application for improvementsin boiler construction, filed December 18, 1909, Serial No. 533,932, ofwhich this application is a division.

Having described my invention, what I claim as new and desire to secureby Letters Patent is:

1. In a steam boiler,in combination, a firebox, a longitudinallyextending water-drum, a transversely extending drum located beneath therear portion of said water-drum and connected therewith, the ends ofsaid second drum projecting beyond the sides of said first drum, andclosed end water-tubes extending rearwardly from said transverse drum.

2. In a steam boiler, in combination, a fire box, a water-drum, atransversely extending drum located beneath said water-drum, a wallsupported by said transverse drum extending up to and around saidwater-drum, an arch extending beneath said water-drum rearwardly to saidWall, a water connection between said drums, and closed end tubesextending rearwardly and downwardly from said transverse drum.

3. In a steam boiler, in combination, a firebox, a water-drum, atransversely extending drum located beneath said water-drum, meansconnecting said drums, closed end tubes extending rearwardly from saidtransverse drum, and a baffle supported by said tubes in parallelrelation therewith.

at. In a steam boiler, in combination, a firebox, a water-drum, atransversely extending drum located beneath said water-drum, meansconnecting said drums, closed end tubes extending rearwardly from saidtransverse drum and positioned beneath the rear portion of saidwater-drum, and a battle supported by said tubes adapted to protect saiddrum from the direct flow of the furnace gases.

In a steam boiler, in combination, a fire-box, a longitudinalwater-drum, a transverse drum positioned beneath the rear portion ofsaid wateredrum and connected therewith, a steam and water-drum,watertubes extending upwardly from said waterdrum to said steam andwater-drum, closed end water-tubes extending rearwardly from saidtransverse drum, and a wall supported upon said transverse drum andprojecting upwardly among said first set of tubes.

6. In a steam boiler, in combination, a fire-box, a longitudinalwater-drum, a transverse drum positioned beneath the rear portion ofsaid water-drum and connected therewith, a steam and water-drum,water-tubes extending upwardly from said water-drum to said steam andwater-drum, closed end water-tubes extending rearwardly from saidtransverse drum, and a wall supported upon said last drum and projectingupwardly among said first set of tubes, said first watertubes beingdisposed upon opposite sides of said upwardly projecting wall.

7. In a steam boiler, in combination, two distinct fire-boxes, eachprovided with an arch extending rearwardly from the front boiler wall, alongitudinal water-drum positioned above and between said arches, atransverse drum positioned substantially beneath the rear end of saidarches, a wall supported by said last drum and rising to meet saidarches, means embedded in said wall adapted to connect said drums, andclosed end tubes extending rearwardly from said transverse drum andhaving their outer ends supported in the rear boiler wall.

8. In a steam boiler, in combination, a fire-box, a water-drum, apartition dividing said water-drum into front and rear chambers, atransversely extending drum connected to said rear chamber and disposedbeneath the same, a steam and water-drum, water-tubes extending upwardlyfrom said water-drum to said steam and water-drum, closed endwater-tubes extending rearwardly from said transverse drum, and a feedwater connection to said front chamber.

In testimony whereof I affix my signature, in the presence of twowitnesses.

ALISON B. srrnm xo.

Witnesses:

R. S. BLAIR, EVERETT J. PEOK.

